Effect of alloying elements (Zr, Hf, Co), heat and mechanical treatment conditions on the phase composition and magnetic properties of SmFe11Ti compounds with ThMn12 structure

The results of thermomagnetic, metallographic and X-ray diffraction phase analysis as well as the measurements of specific magnetization (σs), Curie temperature (TC), coercive force (HC) of (Sm,M)(Fe,M)12-xTix alloys samples, where M = Zr, Hf, Co with the ThMn12 main phase structure (1-12) are presented. The effect of the annealing temperature and the cooling rate on the formation of 1-12 phase and its magnetic properties, including the effect of high-energy milling on the magnetic hysteresis properties and alloys structure are described. It was found that the highest magnetic characteristics such as σs = 112.6 emu/g and TC = 600°C are attained in the (Sm0.8Zr0.2)(Fe0.75Co0.25)11.4Ti0.6 alloy after its annealing at 1050 °C and rapid cooling. It is noted that a mechanical milling of the alloy leads to 1-12 phase amorphization which accompanied by an α-(Fe) or metal Co phases impurity formation. © 2018 The Authors, published by EDP Sciences.The work was supported by the State contracts No. 3.6121.2017/ 8.9 between UrFU and the Ministry of Education and Science of Russian Federation and by the Fund of assistance to development of small enterprises in scientific-technical sphere No. 11996GU / 017

Solvent content of protein crystals from diffraction intensities by Independent Component Analysis

An analysis of the protein content of several crystal forms of proteins has been performed. We apply a new numerical technique, the Independent Component Analysis (ICA), to determine the volume fraction of the asymmetric unit occupied by the protein. This technique requires only the crystallographic data of structure factors as input.Comment: 9 pages, 2 figures, 1 tabl

Effect of intergrain exchange interaction on magnetic viscosity of nanocrystalline isotropic NdFeB magnets

The coefficient of magnetic viscosity, S, of NdFeB alloys with varied intergrain exchange interaction constant, K IEI, was measured. The observed dependences of fluctuation field, H f, on the applied field, H, are strongly correlated with K IEI value. Cooperative magnetization reversal of single domain interacting particles leads to improve the temperature stability of permanent magnets and magnetic systems based on them. © Published under licence by IOP Publishing Ltd

Investigation of magnetization reversal processes in Sm(Co, Fe, Cu, Zr)7.5 magnets

The processes of magnetization reversal in isotropic and anisotropic commercial permanent magnets Sm(Co, Fe, Cu, Zr)7.5 were investigated. Features of magnetization reversal process in both textured and isotropic magnets were analyzed with δM(H) plots, magnetic susceptibility and initial magnetization curves. The magnetization reversal of Sm(Co, Fe, Cu, Zr)7.5 magnets is more complicated than that described in the coercivity model based on the domain walls pinning. © Published under licence by IOP Publishing Ltd.The work was supported by Act 211 Government of the Russian Federation, contract № 02.A03.21.0006

Magnetization Reversal Processes in Sintered Permanent Magnets Sm(Co, Fe, Zr, Cu)Z

The magnetic properties of permanent magnets Sm(Co0.796–xFe0.177CuxZr0.027)6.63 (x = 0.117 and 0.131) were investigated. A model of magnetization reversal processes is proposed to explain why in some the magnets exhibit a pinning mechanism of magnetization reversal and in some a nucleation.Работа выполнена при финансовой поддержке проекта РФФИ № 20-32-90211

The Magnetic Properties of a NdFeB Permanent Magnets Prepared by Selective Laser Sintering

Abstract—The additive manufacturing of functional materials has a number of advantages over the sintering, which consist in the possibility of fabricating near-net-shape and locally forming the properties. In the present study, the effect of synthesis parameters on the phase composition and magnetic hysteretic properties of single-layer Nd2Fe14B-based permanent magnets synthesized by selective laser sintering is investigated. The causes for the effect of synthesis parameters on the magnetic hysteretic properties are considered. The possibility of reaching a coercivity of single-layer magnets of 19.5 kOe, which are free of heavy rare-earth metals, is demonstrated. © 2022, The Author(s).Russian Science Foundation, RSF, (21-72-10104)The study was supported by the Russian Science Foundation, project no. 21-72-10104

Sm–Fe–Ti COMPOUNDS AS A NEW MATERIAL FOR PERMANENT MAGNETS

In this work were measured magnetic properties of compounds based on Sm−Fe−Ti with crystal structure ThMn12 and investigated effect of substitution of elements in rare earth and 3d- sublattices on phase composition and magnetic properties of this material. The obtained properties make it possible to treat this class of compounds as an a-ternative to the Nd−Fe−B magnetic material.Данная работа выполнена при поддержке: Государственного контракта № 3.6121.2017/БЧ между УрФУ и Министерством образования и науки Российской Федерации

DEVELOPMENT OF A PROTOTYPE OF A DEVICE FOR MEASURING THE TEMPERATURE COEFFICIENT OF INDUCTION OF PERMANENT MAGNETS

The prototype of measuring cell and the control circuit of the device is designed on the microcontroller Arduino Mega 2560 for measuring the temperature coefficient of induction of permanent magnets with an accuracy of 0.3 %/°С.Данная работа выполнена при поддержке Государственного контракта № 3.6121.2017/БЧ между УрФУ и Министерством образования и науки Российской Федерации

Magnetic Characteristics of Nd-Fe-B 3D-Prined Permanent Magnets

Work is devoted to the study of additive manufacturing methods used for 3D-printing of permanent magnets, establishing the relationship between the magnetic hysteresis properties of samples of single-layer permanent magnets of the Nd-Fe-B system and conditions of their synthesis by SLS by experiment.Работа выполнена при финансовой поддержке гранта РНФ № 21-72-10104

REMAGNETIZATION PROCESSES IN SINTERED Sm-Co И Nd-Fe-B PERMANENT MAGNETS

The processes of remagnetization in permanent magnets of the Sm2Co17 and Nd2Fe14B systems were studied. The mechanism for the formation of coercivity is established via su-perposition coherent rotation or pinning in accordance of the Kondorski and Stoner-Wohlfarth models.Проект выполнен при финансовой поддержке Российского фонда фундаментальных исследований, грант № 20-32-90211\20